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Plenum cable / ˈ p l ɛ n əm / is electrical cable that is laid in the plenum spaces of buildings. In the United States , plastics used in the construction of plenum cable are regulated under the National Fire Protection Association standard NFPA 90A: Standard for the Installation of Air Conditioning and Ventilating Systems.
Mineral-insulated copper-clad cable is a variety of electrical cable made from copper conductors inside a copper sheath, insulated by inorganic magnesium oxide powder. The name is often abbreviated to MICC or MI cable, and colloquially known as pyro (because the original manufacturer and vendor for this product in the UK was a company called ...
The cable is normally double-insulated (insulation plus black sheath) and both UV and higher temperature resistant (most cables deteriorate if used outdoors without protection from sunlight). Connectors are typically attached by crimping , though soldering is also possible.
The NEC is developed by NFPA's Committee on the National Electrical Code, which consists of twenty code-making panels and a technical correlating committee. Work on the NEC is sponsored by the National Fire Protection Association. The NEC is approved as an American national standard by the American National Standards Institute (ANSI). It is ...
Each is rated to protect against personal access to hazardous parts, and additional type-dependent designated environmental conditions. A typical NEMA enclosure might be rated to provide protection against environmental hazards such as water , dust , oil or coolant or atmospheres containing corrosive agents such as acetylene or gasoline .
A snow bridge, avalanche barrier, or avalanche fence, looks superficially similar to snow fences, but they act differently. Snow fences are built vertically and accumulate snow on their downwind side, while snow bridges are slanted or horizontal and hold snow on their top side. [citation needed] Snow bridges are fastened to the slope on the ...
Snow fences work by causing turbulence in the wind, such that it drops much of its snow load on the lee side of the fence. Thus, snow fences cause snow drifts rather than preventing them. The fences are placed to cause snow to drift where beneficial or not harmful so that the snow does not drift onto undesired areas such as roads or buildings ...
Special protection s This method, being by definition special, has no specific rules. In effect it is any method which can be shown to have the required degree of safety in use. Much early equipment having Ex s protection was designed with encapsulation and this has now been incorporated into IEC 60079-18 [Ex m].